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Finding the Fourth Proportional to 717,662.76, 990,339.12 and 395,364.30

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Solution

The fourth proportional to 717,662.76, 990,339.12 and 395,364.30 is: 545,583.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,662.76 : 990,339.12 = 395,364.30 : x
  2. Step 2: Convert to fraction form
    717,662.76/990,339.12 = 395,364.30/x
  3. Step 3: Cross multiply
    717,662.76x = 990,339.12 × 395,364.30
  4. Step 4: Simplify right side
    717,662.76x = 391,544,732,941.42
  5. Step 5: Solve for x
    x = 391,544,732,941.42/717,662.76
  6. Step 6: Final answer
    x = 545,583.18

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.